All Models (1973)
- Turn mixture screws in (clockwise) until screws lightly contact seat, then back out (counterclockwise) each screw four full turns.
- Adjust idle stop solenoid or idle speed screw to achieve specified initial idle RPM, then adjust mixture screws in (clockwise) equally to obtain final idle RPM.
- When idle mixture setting is specified as 1/4 turn from lean roll, turn mixture screws equally in (clockwise) to a 20 RPM drop, then back out (counterclockwise) 1/4 turn.
- Install new idle limiter caps, and reconnect distributor vacuum advance hose and fuel tank vapor canister hose (if Corvette, replace gas cap).
Preliminary Idle Speed Specifications
| Application |
Initial Idle RPM |
Final Idle RPM |
| 140" |
| |
Auto. Trans. |
800 |
750 |
| Man. Trans. |
800 |
700 |
| 250" |
| |
Auto. Trans. |
630 |
600 |
| Man. Trans. |
750 |
700 |
| 307" |
| |
Auto. Trans. |
630 |
600 |
| Man. Trans. |
950 |
900 |
| 350" 2-Bbl. |
| |
Auto. Trans. |
630 |
600 |
| Man. Trans. |
1000 |
900 |
| 350" 4-Bbl. |
| |
Auto. Trans. |
620 |
600 |
| Man. Trans. |
920 |
900 |
| 350" 4-Bbl. High Performance |
| |
Auto. Trans. |
720 |
700 |
| 400" |
| |
Auto. Trans. |
630 |
600 |
| 454" |
| |
Auto. Trans. |
625 |
600 |
| Man. Trans. |
925 |
900 |